What is the difference between carbon fiber material and metal materials?

Carbon fiber materials and traditional metal materials are widely used in different fields, and the different characteristics between carbon fiber materials and metal materials are also used in different designs. The following is the comparison of the characteristics and differences between carbon fiber composites and traditional metals.

Stiffness and Strength

Compared with metal materials, carbon fiber materials are lighter in weight, higher in specific strength and specific stiffness. The modulus and strength of 6 series aluminum are lower than that of carbon steel, but its density is smaller.

The modulus of carbon carbon fiber is higher than that of aluminum alloy, and its strength can reach the level of high strength steel by design, which is much higher than that of aluminum alloy.


Metal materials are usually isotropic, yielding or conditional yielding. The monolayer carbon fiber has obvious directivity. The mechanical properties of the monolayer along the fiber direction are higher than those in the vertical fiber direction and the longitudinal and transverse shear properties, and the stress-strain curve shows a linear elastic relationship before fracture.

Carbon fiber materials can choose single layer laying angle, laying ratio and laying sequence. Targeted design requires stiffness and strength performance, while traditional metal materials can only be achieved by thickening.

Corrosion Resistance

Compared with metal materials, carbon fiber materials have strong acid and alkali corrosion resistance. Carbon fiber is a microcrystalline structure similar to graphite crystal formed by graphitization at 2000 Mel 3000 ℃. This structure itself has high medium corrosion resistance and can remain basically unchanged in terms of elastic modulus, strength and diameter in up to 50% hydrochloric acid, sulfuric acid or phosphoric acid.

Therefore, as a reinforced material, carbon fiber has sufficient guarantee in corrosion resistance, and different matrix resins have different corrosion resistance. For example, the common carbon fiber reinforced epoxy resin has good weather resistance and can still maintain the strength.

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